<!DOCTYPE html>
<div class="b_btm_bg b_btm_c" id="footer_up"></div>
<div class="b_nav" id="footer_middle"></div>
<div class="btmbg" id="footer_down"></div>
<script type="text/javascript">
    $(document).ready(function() {
        $('#footer_up').load('/html/comm/footer_up.html');
        $('#footer_middle').load('/html/comm/footer_middle.html');
        $('#footer_down').load('/html/comm/footer_down.html');
    });
</script>